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Exxon Mobil Corp. -2- March 5, 2009 <br /> Claim No. 5312 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Se 08 <br /> IW-1 Jan 91. 27-47 17.40 <br /> MW-1 Jan 87 11-30 16.61 <br /> MW-2 Jan 87 10-30 17.58 <br /> MW-3 Jan 87 10-30 19.32 <br /> MW-4 Jan 87 10-30 17.70 <br /> MW-5 Jul 87 10-30 19.32 <br /> MW-6 Jul 87 10-30 18.18 <br /> MW-7 Jul 87 10-32 17.11 <br /> MW-8 Feb 88 11-30 16.48 <br /> MW-9 Feb 88 10-30 17.00 <br /> MW-10 Apr 88 10-35 18.94 <br /> MW-12 Jan 91 24-39 19.75 <br /> MW-13 May 93 25-45 20.41 <br /> MTBE THREAT CLASSIFICATION: C <br /> LAND USE DESIGNATION: residential and commercial <br /> ESTIMATED WATER QUALITY OBJECTIVES (WQO'S) FOR SITE: Per the <br /> Water Quality Control Plan (Basin Plan) for the Sacramento River Basin and the <br /> San Joaquin River Basin (Fourth Edition). <br /> IV. MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m /k ESLs Water (ug/L WQOs <br /> Maximum Latest Shallow Industriae Maximum Latest (ug/L) <br /> Soil (Sep 08) <br /> Dermal <br /> Residential(mg/kg) (mg/kg) <br /> TPH NA NA 83 450 FP 70,000 5 <br /> TPH-d NA NA 83 450 FP NA 56 <br /> Benzene I NA NA 0.044 1 0.27 FP 3,500 0.15 <br /> Toluene NA NA 2.9 210 FP 18,000 42 <br /> Eth (benzene NA NA 2.3 5.0 FP 3,000 29 <br /> Xylenes NA NA 2.3 100 FP 17,000 17 <br /> MTBE NA NA 0.023 65 FP 38 5 <br /> TBA NA NA 0.075 320,000 FP NA 12 <br /> 1,2-DCA NA NA 0.0045 0.48 FP NA 0.4 <br /> Lead NA NA 200 750 FP NA 15 <br /> PCE NA NA 0.37 0.95 NA NA 0.06 <br /> TCE NA NA 0.46 4.1 NA NA 0.8 <br /> 1 Environmental Screening Levels(ESLs)Shallow Soil<3m,Groundwater is source of Drinking Water- <br /> 2 ESLs,Shallow Soil Screening Levels,Groundwater not source of Drinking Water,Commercial Use,Direct Exposure, <br /> Worker <br /> NA Not Analyzed,Not Applicable,or Data Not Available <br /> WQO Water Quality Objectives <br /> FP Free phase product in site wells <br /> CaMormra Envzronmenta/Protectlon Agency <br /> Zoo R�ycedPaa, <br />